if_atm.c

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    1 /*      $NetBSD: if_atm.c,v 1.6 1996/10/13 02:03:01 christos Exp $       */
    2 
    3 /*-
    4  *
    5  * Copyright (c) 1996 Charles D. Cranor and Washington University.
    6  * All rights reserved.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  * 3. All advertising materials mentioning features or use of this software
   17  *    must display the following acknowledgement:
   18  *      This product includes software developed by Charles D. Cranor and
   19  *      Washington University.
   20  * 4. The name of the author may not be used to endorse or promote products
   21  *    derived from this software without specific prior written permission.
   22  *
   23  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   24  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   25  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   26  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   27  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   28  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   29  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   30  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   31  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   32  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   33  */
   34 #include <sys/cdefs.h>
   35 __FBSDID("$FreeBSD$");
   36 
   37 /*
   38  * IP <=> ATM address resolution.
   39  */
   40 #include "opt_inet.h"
   41 #include "opt_inet6.h"
   42 #include "opt_natm.h"
   43 
   44 #if defined(INET) || defined(INET6)
   45 
   46 #include <sys/param.h>
   47 #include <sys/systm.h>
   48 #include <sys/queue.h>
   49 #include <sys/mbuf.h>
   50 #include <sys/socket.h>
   51 #include <sys/sockio.h>
   52 #include <sys/syslog.h>
   53 
   54 #include <net/if.h>
   55 #include <net/if_var.h>
   56 #include <net/if_dl.h>
   57 #include <net/route.h>
   58 #include <net/if_atm.h>
   59 
   60 #include <netinet/in.h>
   61 #include <netinet/if_atm.h>
   62 
   63 #ifdef NATM
   64 #include <netnatm/natm.h>
   65 #endif
   66 
   67 #define SDL(s) ((struct sockaddr_dl *)s)
   68 
   69 #define GET3BYTE(V, A, L)       do {                            \
   70         (V) = ((A)[0] << 16) | ((A)[1] << 8) | (A)[2];          \
   71         (A) += 3;                                               \
   72         (L) -= 3;                                               \
   73     } while (0)
   74 
   75 #define GET2BYTE(V, A, L)       do {                            \
   76         (V) = ((A)[0] << 8) | (A)[1];                           \
   77         (A) += 2;                                               \
   78         (L) -= 2;                                               \
   79     } while (0)
   80 
   81 #define GET1BYTE(V, A, L)       do {                            \
   82         (V) = *(A)++;                                           \
   83         (L)--;                                                  \
   84     } while (0)
   85 
   86 
   87 /*
   88  * atm_rtrequest: handle ATM rt request (in support of generic code)
   89  *   inputs: "req" = request code
   90  *           "rt" = route entry
   91  *           "info" = rt_addrinfo
   92  */
   93 void
   94 atm_rtrequest(int req, struct rtentry *rt, struct rt_addrinfo *info)
   95 {
   96         struct sockaddr *gate = rt->rt_gateway;
   97         struct atmio_openvcc op;
   98         struct atmio_closevcc cl;
   99         u_char *addr;
  100         u_int alen;
  101 #ifdef NATM
  102         struct sockaddr_in *sin;
  103         struct natmpcb *npcb = NULL;
  104 #endif
  105         static struct sockaddr_dl null_sdl = {sizeof(null_sdl), AF_LINK};
  106 
  107         if (rt->rt_flags & RTF_GATEWAY)   /* link level requests only */
  108                 return;
  109 
  110         switch (req) {
  111 
  112         case RTM_RESOLVE: /* resolve: only happens when cloning */
  113                 printf("atm_rtrequest: RTM_RESOLVE request detected?\n");
  114                 break;
  115 
  116         case RTM_ADD:
  117                 /*
  118                  * route added by a command (e.g. ifconfig, route, arp...).
  119                  *
  120                  * first check to see if this is not a host route, in which
  121                  * case we are being called via "ifconfig" to set the address.
  122                  */
  123                 if ((rt->rt_flags & RTF_HOST) == 0) {
  124                         rt_setgate(rt,rt_key(rt),(struct sockaddr *)&null_sdl);
  125                         gate = rt->rt_gateway;
  126                         SDL(gate)->sdl_type = rt->rt_ifp->if_type;
  127                         SDL(gate)->sdl_index = rt->rt_ifp->if_index;
  128                         break;
  129                 }
  130 
  131                 if (gate->sa_family != AF_LINK ||
  132                     gate->sa_len < sizeof(null_sdl)) {
  133                         log(LOG_DEBUG, "atm_rtrequest: bad gateway value");
  134                         break;
  135                 }
  136 
  137                 KASSERT(rt->rt_ifp->if_ioctl != NULL,
  138                     ("atm_rtrequest: null ioctl"));
  139 
  140                 /*
  141                  * Parse and verify the link level address as
  142                  * an open request
  143                  */
  144 #ifdef NATM
  145                 NATM_LOCK();
  146 #endif
  147                 bzero(&op, sizeof(op));
  148                 addr = LLADDR(SDL(gate));
  149                 alen = SDL(gate)->sdl_alen;
  150                 if (alen < 4) {
  151                         printf("%s: bad link-level address\n", __func__);
  152                         goto failed;
  153                 }
  154 
  155                 if (alen == 4) {
  156                         /* old type address */
  157                         GET1BYTE(op.param.flags, addr, alen);
  158                         GET1BYTE(op.param.vpi, addr, alen);
  159                         GET2BYTE(op.param.vci, addr, alen);
  160                         op.param.traffic = ATMIO_TRAFFIC_UBR;
  161                         op.param.aal = (op.param.flags & ATM_PH_AAL5) ?
  162                             ATMIO_AAL_5 : ATMIO_AAL_0;
  163                 } else {
  164                         /* new address */
  165                         op.param.aal = ATMIO_AAL_5;
  166 
  167                         GET1BYTE(op.param.flags, addr, alen);
  168                         op.param.flags &= ATM_PH_LLCSNAP;
  169 
  170                         GET1BYTE(op.param.vpi, addr, alen);
  171                         GET2BYTE(op.param.vci, addr, alen);
  172 
  173                         GET1BYTE(op.param.traffic, addr, alen);
  174 
  175                         switch (op.param.traffic) {
  176 
  177                           case ATMIO_TRAFFIC_UBR:
  178                                 if (alen >= 3)
  179                                         GET3BYTE(op.param.tparam.pcr,
  180                                             addr, alen);
  181                                 break;
  182 
  183                           case ATMIO_TRAFFIC_CBR:
  184                                 if (alen < 3)
  185                                         goto bad_param;
  186                                 GET3BYTE(op.param.tparam.pcr, addr, alen);
  187                                 break;
  188 
  189                           case ATMIO_TRAFFIC_VBR:
  190                                 if (alen < 3 * 3)
  191                                         goto bad_param;
  192                                 GET3BYTE(op.param.tparam.pcr, addr, alen);
  193                                 GET3BYTE(op.param.tparam.scr, addr, alen);
  194                                 GET3BYTE(op.param.tparam.mbs, addr, alen);
  195                                 break;
  196 
  197                           case ATMIO_TRAFFIC_ABR:
  198                                 if (alen < 4 * 3 + 2 + 1 * 2 + 3)
  199                                         goto bad_param;
  200                                 GET3BYTE(op.param.tparam.pcr, addr, alen);
  201                                 GET3BYTE(op.param.tparam.mcr, addr, alen);
  202                                 GET3BYTE(op.param.tparam.icr, addr, alen);
  203                                 GET3BYTE(op.param.tparam.tbe, addr, alen);
  204                                 GET1BYTE(op.param.tparam.nrm, addr, alen);
  205                                 GET1BYTE(op.param.tparam.trm, addr, alen);
  206                                 GET2BYTE(op.param.tparam.adtf, addr, alen);
  207                                 GET1BYTE(op.param.tparam.rif, addr, alen);
  208                                 GET1BYTE(op.param.tparam.rdf, addr, alen);
  209                                 GET1BYTE(op.param.tparam.cdf, addr, alen);
  210                                 break;
  211 
  212                           default:
  213                           bad_param:
  214                                 printf("%s: bad traffic params\n", __func__);
  215                                 goto failed;
  216                         }
  217                 }
  218                 op.param.rmtu = op.param.tmtu = rt->rt_ifp->if_mtu;
  219 #ifdef NATM
  220                 /*
  221                  * let native ATM know we are using this VCI/VPI
  222                  * (i.e. reserve it)
  223                  */
  224                 sin = (struct sockaddr_in *) rt_key(rt);
  225                 if (sin->sin_family != AF_INET)
  226                         goto failed;
  227                 npcb = npcb_add(NULL, rt->rt_ifp, op.param.vci,  op.param.vpi);
  228                 if (npcb == NULL)
  229                         goto failed;
  230                 npcb->npcb_flags |= NPCB_IP;
  231                 npcb->ipaddr.s_addr = sin->sin_addr.s_addr;
  232                 /* XXX: move npcb to llinfo when ATM ARP is ready */
  233 #ifdef __notyet_restored__
  234                 rt->rt_llinfo = (caddr_t) npcb;
  235 #endif
  236                 rt->rt_flags |= RTF_LLINFO;
  237 #endif
  238                 /*
  239                  * let the lower level know this circuit is active
  240                  */
  241                 op.rxhand = NULL;
  242                 op.param.flags |= ATMIO_FLAG_ASYNC;
  243                 if (rt->rt_ifp->if_ioctl(rt->rt_ifp, SIOCATMOPENVCC,
  244                     (caddr_t)&op) != 0) {
  245                         printf("atm: couldn't add VC\n");
  246                         goto failed;
  247                 }
  248 
  249                 SDL(gate)->sdl_type = rt->rt_ifp->if_type;
  250                 SDL(gate)->sdl_index = rt->rt_ifp->if_index;
  251 
  252 #ifdef NATM
  253                 NATM_UNLOCK();
  254 #endif
  255                 break;
  256 
  257 failed:
  258 #ifdef NATM
  259                 if (npcb) {
  260                         npcb_free(npcb, NPCB_DESTROY);
  261 #ifdef __notyet_restored__
  262                         rt->rt_llinfo = NULL;
  263 #endif
  264                         rt->rt_flags &= ~RTF_LLINFO;
  265                 }
  266                 NATM_UNLOCK();
  267 #endif
  268                 /* mark as invalid. We cannot RTM_DELETE the route from
  269                  * here, because the recursive call to rtrequest1 does
  270                  * not really work. */
  271                 rt->rt_flags |= RTF_REJECT;
  272                 break;
  273 
  274         case RTM_DELETE:
  275 #ifdef NATM
  276                 /*
  277                  * tell native ATM we are done with this VC
  278                  */
  279                 if (rt->rt_flags & RTF_LLINFO) {
  280                         NATM_LOCK();
  281 #ifdef __notyet_restored__
  282                         npcb_free((struct natmpcb *)rt->rt_llinfo,
  283                             NPCB_DESTROY);
  284                         rt->rt_llinfo = NULL;
  285 #endif
  286                         rt->rt_flags &= ~RTF_LLINFO;
  287                         NATM_UNLOCK();
  288                 }
  289 #endif
  290                 /*
  291                  * tell the lower layer to disable this circuit
  292                  */
  293                 bzero(&op, sizeof(op));
  294                 addr = LLADDR(SDL(gate));
  295                 addr++;
  296                 cl.vpi = *addr++;
  297                 cl.vci = *addr++ << 8;
  298                 cl.vci |= *addr++;
  299                 (void)rt->rt_ifp->if_ioctl(rt->rt_ifp, SIOCATMCLOSEVCC,
  300                     (caddr_t)&cl);
  301                 break;
  302         }
  303 }
  304 
  305 /*
  306  * atmresolve:
  307  *   inputs:
  308  *     [1] "rt" = the link level route to use (or null if need to look one up)
  309  *     [2] "m" = mbuf containing the data to be sent
  310  *     [3] "dst" = sockaddr_in (IP) address of dest.
  311  *   output:
  312  *     [4] "desten" = ATM pseudo header which we will fill in VPI/VCI info
  313  *   return:
  314  *     0 == resolve FAILED; note that "m" gets m_freem'd in this case
  315  *     1 == resolve OK; desten contains result
  316  *
  317  *   XXX: will need more work if we wish to support ATMARP in the kernel,
  318  *   but this is enough for PVCs entered via the "route" command.
  319  */
  320 int
  321 atmresolve(struct rtentry *rt, struct mbuf *m, const struct sockaddr *dst,
  322     struct atm_pseudohdr *desten)
  323 {
  324         struct sockaddr_dl *sdl;
  325 
  326         if (m->m_flags & (M_BCAST | M_MCAST)) {
  327                 log(LOG_INFO,
  328                     "atmresolve: BCAST/MCAST packet detected/dumped\n");
  329                 goto bad;
  330         }
  331 
  332         if (rt == NULL) {
  333                 /* link level on table 0 XXX MRT */
  334                 rt = RTALLOC1(__DECONST(struct sockaddr *, dst), 0);
  335                 if (rt == NULL)
  336                         goto bad;       /* failed */
  337                 RT_REMREF(rt);          /* don't keep LL references */
  338                 if ((rt->rt_flags & RTF_GATEWAY) != 0 ||
  339                     rt->rt_gateway->sa_family != AF_LINK) {
  340                         RT_UNLOCK(rt);
  341                         goto bad;
  342                 }
  343                 RT_UNLOCK(rt);
  344         }
  345 
  346         /*
  347          * note that rt_gateway is a sockaddr_dl which contains the
  348          * atm_pseudohdr data structure for this route.   we currently
  349          * don't need any rt_llinfo info (but will if we want to support
  350          * ATM ARP [c.f. if_ether.c]).
  351          */
  352         sdl = SDL(rt->rt_gateway);
  353 
  354         /*
  355          * Check the address family and length is valid, the address
  356          * is resolved; otherwise, try to resolve.
  357          */
  358         if (sdl->sdl_family == AF_LINK && sdl->sdl_alen >= sizeof(*desten)) {
  359                 bcopy(LLADDR(sdl), desten, sizeof(*desten));
  360                 return (1);     /* ok, go for it! */
  361         }
  362 
  363         /*
  364          * we got an entry, but it doesn't have valid link address
  365          * info in it (it is prob. the interface route, which has
  366          * sdl_alen == 0).    dump packet.  (fall through to "bad").
  367          */
  368 bad:
  369         m_freem(m);
  370         return (0);
  371 }
  372 #endif /* INET */
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FreeBSD/Linux Kernel Cross Reference sys/netinet/if_atm.c

FreeBSD/Linux Kernel Cross Reference
sys/netinet/if_atm.c
